As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING AN OVERNIGHT LINE CHECK THE LT FORWARD EMERGENCY EXIT SIGN WAS INOPERATIVE. MX ATTEMPTED TO REPLACE THE ASSOCIATED BATTERY PACK, BUT THE PROBLEM REMAINED. REPLACEMENT OF THE POWER SUPPLY MODULE FOR THE AFFECTED BATTERY PACK CORRECTED THE PROBLEM. ALL OPS CHECKED NORMAL AFTER REPLACEMENT OF THE POWER SUPPLY.